Ruby on rails: nested attribute form doesn't show up

Question

I am working on Rails 3.1.1.rc3 and I have 2 classes as shown below.

class Customer < ActiveRecord::Base
  has_many :orders, :dependent => :destroy
  accepts_nested_attributes_for :orders
end

class Order < ActiveRecord::Base
  belongs_to :customer
end

In my form:

<%= form_for(@customer) do |f| %>
  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name,:class=>'textbox' %>
  </div>

  <%= f.fields_for :orders do |order_form| %>   
    <div class="field">
       <%= order_form.label :number %><br />
       <%= order_form.text_field :number, :class=>'textbox' %>
   </div>  
  <%end%>

<%end%>

When it renders, the first part of the form (for customer) shows up, but the second part (for order) doesn't. Any pointers are appreciated. Thanks.

For anyone who is interested, this is a very good article.link here — revolver
– revolver, Commented Dec 21, 2011 at 3:10

Frederick Cheung · Accepted Answer · 2011-12-20 08:12:20Z

4

Two things. First fields_for basically iterates over customer.orders so if there are no orders you'll get no output. If you just want some blank fields for users to input order details you'd typically stick

@customer.orders.build

In your controller. Secondly, fields_for is very similar to form_for, you need to use <%= for it too

answered Dec 20, 2011 at 8:12

Frederick Cheung

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Comments

cristian · Accepted Answer · 2011-12-20 08:20:10Z

1

add

<%= f.fields_for :orders do |order_form| %>

instead of

<% f.fields_for :orders do |order_form| %>

Edit: have a look at how fields_for is defined (there are examples there)

edited Dec 20, 2011 at 8:20

answered Dec 20, 2011 at 8:10

cristian

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2 Comments

Michael Koper Over a year ago

This is the right answer. In rails 3 you have to put = to helpers that generate any kind of output, like form_for, fields_for etc.

revolver Over a year ago

Just tried. The second form doesn't show up either. But that's a good points. Thanks. Edited my question.

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